* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

.clickable-area {
    height: 100vh;
    width: 100%;
    cursor: pointer;
    background: limegreen;
    display: grid;
    place-items: center;
    font-size: 32px;
    font-family: "Roboto", sans-serif;
    color: white;
}

.end-screen,
.main-screen {
    display: none;
    position: fixed;
    height: 100vh;
    width: 100%;
    top: 0;
    left: 0;
    background: rgb(3, 0, 95);
    color: white;
    font-family: "Roboto", sans-serif;
    text-align: center;
}

.main-screen.active,
.end-screen.active {
    display: grid;
    place-items: center;
}

.main-screen{
    cursor: pointer;
}

.container{
    max-width: 700px;
    padding: 0 32px;
}

.main-screen h1{
    font-size: 80px;
    margin: 8px 0;
}

.container p {
    font-size: 20px;
    line-height: 2;
    font-weight: 800;
    margin: 0;
}

.end-screen h1{
    font-size: 30px;
}

.reaction-time-text{
    font-size: 100px;
    font-weight: 900;
}

.end-screen .play-again-btn {
    border: none;
    background-color: rgb(255, 255, 255);
    font-size: 20px;
    padding: 8px 32px;
    margin-top: 20px;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: 4px;
    cursor: pointer;
}